Celebrities attending Saturday's 25th annual Kids' Choices Awards should start getting nervous. Really nervous. While awards are presented during the kid-friendly Nickelodeon show, fans really just want to see the slime.
From Mary-Kate and Ashley Olsen's double slime to Katy Perry's shocking green surprise, it's always fun to see stars -- especially those always looking their best -- get covered in that bright, sticky, Nickelodeon-signature goo.
We've rounded up some of our favorite KCA slime moments below to get you ready for tonight's show, which kicks off on Nickelodeon at 8 p.m.
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